In satellite dishes, part of the receiver electronics, the RF front end, is usually mounted in a box just behind the feed horn. This converts the high satellite microwave downlink frequencies to a lower frequency so it can be more easily sent through the coaxial cablefeedline to the receiver inside the building. This is called the low-noise blockconverter (LNB), and the unit consisting of the horn plus the converter is called the LNB with feedhorn (LNBF).

Feed horn on a military radar antenna. The feed horn must be shaped to produce a radiation pattern tailored to adequately illuminate the reflector.